How do I move my Backlog from one project to another?

[Erin Dorgan]

We are retiring a project, but have a built out backlog that we want to migrate to a new, next-gen project. The bulk issue move requires search results, but isolating issues from the backlog isn't an option. Is it possible to isolate backlog tasks via the Advanced query?

Is there some other intuitive way to migrate the backlog from one project to another?

Thank you in advance for the help! 

[Nic Brough -Adaptavist-]

Is transition 1 representing a transition that exists in the workflow?  Is the issue in the right status?  (i.e. the transition is the one that takes it out of that status/step to the desired one?).  Does the workflow have any validators or conditions on it that might be blocking the transtion? (Although I'd expect an error there, rather than a simple 204)

Edit: sorry, that was far too short!  I've tried to improve it.

[sbmaggarwal]

I tried values from 1 to 20 randomly.. None works. I mean I get a 204 No Content response but status doesn't change. To answer your question, 1 is valid.

[Nic Brough -Adaptavist-]

Random numbers really aren't going to do anything!  Could you look at the text view of the workflow?  Especially for the step the issue is currently in?

[Steven F Behnke]

Just a tidbit to add to Nic's great answer, you can use the API to get all transitions and ID's valid for your current state for a specific issue – http://jira.example.com/rest/api/2/issue/TST-123/transitions

The documentation for this REST endpoint is avaliable here – https://docs.atlassian.com/jira/REST/latest/#api/2/issue-getTransitions

Otherwise Nic is right, the correct id value is in the Workflow Editor.